A person who pretends to have money, influence, or ability.
‘the camaraderie among tinhorns and crooks’
‘tinhorn sharpers’
‘But the larger, more frightening meaning of his statement is that in order to rid the world of a tinhorn dictator who posed no credible threat to the United States, it was just dandy to lie to the people.’
‘He is no conservative, he's a crackpot - a tinhorn autocrat who has mistaken totalitarianism for conservatism.’
‘After Urban Cowboy came out even here in Texas we endured several years of overdone, tinhorn headgear.’
‘Other letters offer versions of a common logical fallacy: because Hitler had small beginnings, any tinhorn fanatic is likely to become a Hitler… when in fact most will not (and it is problematic to identify which if any might).’